but as our joe johns reports, some of the most notorious scandals also happen in the second term. >> reporter: president obama has high hopes for the next four years. >> i intend to carry out the agenda that i campaigned on. >> reporter: if he wants to reach that goal, history says a second-term president has got to move fast. >> power does seep away from the presidency very quickly in the second term. >> second term presidents and their congresses have two different clocks. and the president's clock is now moving toward history. and the longer view, and he can take more risks. the congressional clock is still going, according to the next election. >> reporter: but he can't push too hard. former reagan chief of staff, ken duberstein says after a second win, most presidents have an inflated view of their power. >> you have to figure out ways that you can accomplish things and go directionally in the way you're going. realizing that time is an enemy. get as much done as you can, but don't overreach. >> reporter: a lesson president obama promises he's learned. >> i'm more than familiar